iis7_rewrite_rule_exists( string $filename )

Check if rewrite rule for ClassicPress already exists in the IIS 7+ configuration file

Parameters

$filename

(Required) The file path to the configuration file

Return

(bool)

Source

File: wp-admin/includes/misc.php 

function iis7_rewrite_rule_exists($filename) {
	if ( ! file_exists($filename) )
		return false;
	if ( ! class_exists( 'DOMDocument', false ) ) {
		return false;
	}

	$doc = new DOMDocument();
	if ( $doc->load($filename) === false )
		return false;
	$xpath = new DOMXPath($doc);
	$rules = $xpath->query('/configuration/system.webServer/rewrite/rules/rule[starts-with(@name,\'wordpress\')] | /configuration/system.webServer/rewrite/rules/rule[starts-with(@name,\'WordPress\')]');
	if ( $rules->length == 0 )
		return false;
	else
		return true;
}

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Changelog

Changelog
Version Description
WP-2.8.0 Introduced.